convert part of a list to an array

[Richard Andrew x64]

Might I suggest a for loop:

int Limit = selec.Count > 100 ? 100 : selec.Count;

for ( int LoopCount = 0; LoopCount < Limit; LoopCount++ )
copyselection[LoopCount] = selec[LoopCount];

The difficult we do right away... ...the impossible takes slightly longer.

[VJ Reddy]

I think the Take extension method of IEnumerable can be used for this purpose as shown below:

List<int> data = new List<int>(){1,2,3,4,5,6,7,8,9,10};
int[] array = data.Take(5).ToArray();

The Take method takes specified number of elements or the total elements of the list if the total is less than the specified number.

[VJ Reddy]

Good answer. 5!

[VJ Reddy]

Good answer. 5!

[Richard Andrew x64]

Best answer! :thumbsup:

The difficult we do right away... ...the impossible takes slightly longer.

[taha bahraminezhad Jooneghani]

list items have a index, you can use for for selecting 100 item, or if you looking at some value in items use list.Where(p => p.StartsWith("s")) in a Foreach loop.some thing like this:

List<string> lsi = new List<string>();
lsi.Add("sara");
lsi.Add("soo");
lsi.Add("kabab");
foreach (var item in lsi.Where(p => p.StartsWith("s")))
{
Response.Write(item);
}

[Luc Pattyn]

With all the upvoted answers so far, you haven't gotten the proper solution yet IMO; I recommend

int[] mySmallArray=myList.GetRange(startIndex, count).ToArray();

which avoids both a big intermediate array and any visible looping, and doesn't require .NET version 3.5+ :)

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[Luc Pattyn]

you're too generous. :-D

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[Luc Pattyn]

so far, yes. :laugh:

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[Luc Pattyn]

you're really too generous. :-D

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[Dave Kreskowiak]

You sir, are too modest.

Luc Pattyn wrote:

and any visible looping

Way to cover your ass! ;) Curiously, I'll have to dig into the GetRange code now...

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Dave Kreskowiak

[Luc Pattyn]

I'm sure you'll find a loop inside, as well as inside List.ToArray() and Array.Copy(). And even if List.GetRange() were returning an IEnumerable rather than a list, there still would be a loop doing the hard work. :)

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[VJ Reddy]

Really good answer. 5!

[VJ Reddy]

Thank you :-D

[Apocalypse Now]

Use ArrayList. example: ArrayList AryObj= new ArrayList(); for (int i=0; i < selec.Item.Count; i++) { AryObj.Add(selec.Item[i].Text); }

[Luc Pattyn]

IMO you're right! :)

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[Luc Pattyn]

That is bad. ArrayList is the only list that existed back in .NET 1.0 and 1.1; since 2.0 we have generic lists such as List<int> and there is no real use for ArrayList anymore, it is just an equivalent to List<object> and therefore it is superfluous as a type. Furthermore it does not contribute at all to the solution of the OP's problem. :|

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[DaveyM69]

I've just seen this and happened to have reflector open so I've had a look! GetRange uses Array.Copy to copy to a new list:

List list = new List(count);
Array.Copy(this._items, index, list._items, 0, count);
list._size = count;
return list;

as is ToArray but to an array instead:

T[] destinationArray = new T[this._size];
Array.Copy(this._items, 0, destinationArray, 0, this._size);
return destinationArray;

Now quite what Array.Copy is doing I'm not 100% sure as it's an extern function, so perhaps it's using unmanaged code to block copy?

Dave
Binging is like googling, it just feels dirtier. Please take your VB.NET out of our nice case sensitive forum. Astonish us. Be exceptional. (Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

[Apocalypse Now]

Thanks :)